There is only one Microman size. He is 4" tall. The Microladies actually come in four chest sizes. (S,M,L,XL) The XL is pretty unusable for most applications.

The Microsisters are a little shorter than the microlady. MicroSisters are 3 3/4" while the MicroLadies are 4". There are a little better jointed but look more childlike at least to me. Here are pictures of MicroSisters and MicroLadies.

True, there are bigger special versions of the microman. They come painted, with weapons and gear. They even come with differnt character heads. The ones I'm talking about are the Material Force sets are just blank artist figure studies that are exclusive to TRU in Japan and these are the only size. These are made for customizing.